Pulp-screen.



l PATENTED DEQ. 5, 19o5.

F. M. CHAPMAN.

PULPv SGREEN. A'PrLIcATIoN FILED 23.3.1905;

No. 806,641. PATPNTED DPC. 5, 1905. P. M. CHAPMAN.

PULP SCREEN. APPLICATION FILED APILS. 1905.

2 SHEETS-SHEET 2.

7a/wanton f Wan/C M-.Cha/arnzvv J, SM

Stro/nw? S i' UNiTEn STATES.

PATENT OFFICE.

FRANK M. CHAPMAN, OF FORT EDWARD, NEW YORK, ASSIGNOR OF THREE-FOURTHS TO WILLIAM J GALLAGHER, y OF SANDYHILL,

NEW YORK.

PULP-SCREEN.

Patented Dee. 5, 1905.

I ippiiaaonleaipm 3,1906. salama.253.1519.`

.To all whom it may concer-n:

Be it known that I, FRANK M. CHAPMAN, a citizen of the United States, residing at Fort Edward,-in the county of Washington and State of New York, have invented certain new and useful Improvements in Pulp- Screens; and I do hereby declare the following to be a full, clear, and exact description of the invention7 such as will enable others skilled in the art to which it appertains to make and use the same.

My invention. relates to machines for screening pulp in the manufacture of paper,

heretofore known to me.

andparticularly to that class of screens in which-flat screen-plates are used.

The objects of this-invention are to produce a better product in much less time than it takes with a screen-plate of the same size in screensheretofore known and used.

Flexible diaphragms have beenused below the screen-plates and piston and cam mechanism provided for reciprocating the dia hra m to draw the material, which isintro uce upon theu persurfaceof the screenplates,.through sai plates.

My present invention consists in mounting a second diaphragm above the screen-plate andV roviding means to reciprocate 4it with the iaphragm below thescreen-plate. I

vhave found that by using two diaphragms arranged in thismanner just about three times as much stock can be run through the same size plate as can be'done by any screen My screen can also clean more stock through a plate Aof a finer mesh, as the upward .movement of the upper diaphragm by suction tends to-raise any pieces of coarse pulp which may be covlerin perforations in said plate and preventin t e passage of the Iinerpulp therethrough. he invention also consists in certain novel means of cleaning the screen-plate and re- -moving the refuse from the screen and in the other features of construction and combinations of parts hereinafter described, and more particularlyv pointed out in the claims concluding this specification.

In the accom anying drawings, illustrating the preferre embodiment of my' invention, Figure 1 is .a side view of a machine made in accordance with my invention with a portion of the upper part thereof in vertica section. Fig. .2 is a broken end view with the upper part in vertical section.

lon their inner ends.

. While the preferred embodiment of my invention is illustrated in the accompanying drawings and its construction and operation are vdescribed in this specification, the right is .reserved to make such changes from the construction shown and described herein as the scope of the claims hereto appended will permit. 4

In carrying out the invention the screenplateis arranged in a suitable casing, preferably in a horizontal position. The diaphragms are preferably mountedparallel to the screen-plate, one set above and another below -said plate in the casing. Pistons secured to said diaphragms are actuated to reciprocate the latter 4by pitmen carrying camshoes vadapted to work on cams on a shaft mounted near the base of the frame, the piston onlthe upper and lower diaphragms eing connecte together in pairs by rods extending through the yscreen-plate. Downwardly-extendingv sleeves are preferably secured to thel under surface of said plate at the openings for the passage of the connectingrods, `whereby said rods and pitmen are `steadied and retained in vertical positions as vthey move u and down.

The parts are further retaine in vertical ositions and their downward stroke assured) by the guards at the bottom of the pitmen fitting around vertical pins and below coiled` springs arranged on said pins. -The material to be screene is fed to the screen-plates from an inlet-.box or trough, preferably running the entire length of the screen. The stock which goes through the plates passes out into theow-box arranged below the inlet-box, which also pref-- erably extends the wholelength of the screen.`

On the opposite'side of the screen-casing is a longitudinal opening or series of openings V normally closed by spring-pressed plates arranged on the outside. Rods provided with handles on their outer ends extend through said closure-plates and carry scraper-plates The normal position of said scraper-plates when their operating-rods are thrust in isnear the inlet side'of the screen. A vertically-arranged strip is placed longitudinally of the screen 'ust within the inlet-opening and extends slig tly above said opening, acting as a trap and as a protection for the scraper-plates which normally lie beside it. When it is desired to -clean the screen-plates, the scraper-plates are drawn IOO across said plates by means of their operating-rods, and when they reach a point near the other side of the screen the closure-plates are engaged and pressed outward by lugs or projections on the rods, so that the completion of the stroke of said rods and Scrapers .removes the refuse from the screen through the openings in the casing. On the opposite stroke the springs mounted behind the closure-plates cause said plates to close the openings. By limiting the strokes of the scraper so that the lugs or the rods will not come in contact with and open the closureplates said scraper may be used simply as a scraper to facilitate the passage of the stock through, the screen.

Referring more particularly to the drawings, l is the body or casing of the screen supported on legs 2, in which are j ournaled the shaft 3, carrying the drive-pulley 4 and a series of cams 5, upon which the cam-shoes 6 of the pitmen 7 res-t and by means of which .said pitmen are operated. Each of the pitmen is provided with a projecting guard 8, fitting around a pin 9, mounted vertically on the ournal-boXes for the shaft and having a coiled spring 10 around it engaging said guard and normally holding the cam-shoe down upon the cam. Said pitmen support on their upper ends the pistons 11, secured to the lower diaphragms 12, and rods 13 eX'- tend through the screen-plates 14 and connect said pistons with the pistons 15, secured to the upper diaphragm 16. The downwardlyextending tubular sleeves in which the rods 13 work are designated 17. The inlet-box or trough 18 and the outlet or flow-box 19 are shown at the left of Fig. 2, as is also the vertical strip 20, extending above the inletopenings just within the casing. The coiled .springs 21 for retaining the closure-plates 22 1n place are arranged within brackets 23, through which extend the handles 24 of the operating-rods 25 for the scrapers 26. Each of said Scrapers, as shown, has a square block 27 secured upon its operating-rod ahead of the scraper-plates proper by means of a nut 28, which is adapted to come in contact with and press outward the closureplate opposite it when the scraper is drawn across a full stroke, as where it is desired to remove the refuse. It is obvious that any other form of projection or lug on the rods 25 would serve the purpose of the block and nut 28 and may be used in place thereof without departing from the spirit of my invention. It should also be understood that by providing the upper diaphragm of the same size as and adapted to be reciprocated with the lower diaphragm the output of my machine will be three times that of one wherein only the lower diaphragm is used. This has been found by practical experience to be true, and, more than that, my machine turns out. a better product than a single -diaphragm machine and is capable of screening pulp through screen-plates of a liner mesh.

I-Iaving thus described my invention,- what I claim as' new, and desire to secure by Letters Patent, is-

1. In a machine of the character described, the combination with a screen-plate, of a diaphragm arranged above said plate, and means to reciprocate said diaphragm.

2. In av machine of the character described, the combination with a screenplate, of a dia phragm arranged. above and parallel to said screen-plate, and means to reciprocate said diaphragm.

3. In a machine of the character described, the combination with a screen-plate, of a series of diaphragms arranged above said plate, and means to reciprocate said diaphragm.

4. In a machine of the character described, the combination with a screen-plate, of a diaphragm arranged below said plate, a second diaphragm arranged above said plate, and means to reciprocate said diaphragms.

5. In a machine of the character ('lescribed, the combination with a screen-plate, of a diaphragm arranged below said plate, a\second diaphragm arranged above said plate, and means to reciprocate said diaphragms to` gether.

6. In a machine of the character described, the combination with a screen-plate, of a series of diaphragms arranged below said pla te, a second series of diaphragms arranged above said plate, means to recipromlte said diaphragms.

7. In a machine of the character described, the combination with a screen-plate, of a series of diaphragms arranged below said plate, a second series of diaphragms arranged above said plate, and means to reciprocate said diaF phragms together in pairs.

8. In a machine of the character described, the combination with a screen-plate, of a di aphragm arranged below and parallel to said plate, a second diaphragm arranged above and `also parallel with said plate, and means to reciprocate said diaphragms.

9. In a machine ofthe character described, the combination with a screen-plate, of a diaphragm arranged below and parallel to said plate, a second diaphragm arranged above and also parallel to said plate, and means to reciprocate said diaphragms simultaneously.

10. In a machine of the character dcscribed, the combination with a screen-plate, of a diaphragm arranged above said plate, a pitman adapted to reciprocate said diaphragm and extending through said plate,

and means to reciprocate said pitman.

11. In a machine of the character described, the combination with a screen-plate, of a diaphragm arranged above said plate, a pitman adapted to reciprocate said diaphragm, extending through said plate, a sleeve on said plate, fitting around said pit- IOO IIO

man andadapted to guide the same, and means to reciprocate said pitman.

12. In a machine of the character described, the combination with a screen-plate, of a diaphragm arranged above said plate,

la pitman adapted to reciprocate said dia`A hragm and extending through said plate, a aterally-extending guard, on said. pitman, mounted around a pin secured to a iixture, a coiled spring on said pin adapted to press down on said guard, and cam mechanism to reciprocate said pitman.

13. In ya machine of the character de-` scribed, the combination with a screen-plate,`

of`a diaphragm .arranged below said late, a pitman adapted Ito reciprocate sai diaphragm, a vlaterally extending guard, ar-

- ranged onsaid pitman, mounted around a pin secured to a fixture', a coiledspring on said in, adapted to press down on said guar, and cam mechanismv to reciprocate said pitman.

14. In a machine of the ycharacterv described, the combination with a 'screen-plate,l

of adiaphragm arranged below said plate, a second diaphragm arranged above said plate, a pitman secured to one of said diaphragms and having an arm extending throu h said screen-plate and connecting said diap agrn, and means to reciprocate said pitman.

15. In a machine of Athe charactery described, the .combination with a diaphragm arranged below said' plate, a second. dia- I phragm arranged above said plate, a pitman secured to one'of said diaphragms and having an arm extending through said plate and connectin said diaphragmstogether, a sleeve on sai screen-plate itting around said arm and acting as a guide for the-same, and means to reciprocate said pitman.

16. In a machine of the character described, the combination with a casing hav- 'ing an opening on its side, of a` screen-plate arranged in said casing on a level with said opening, a spring -pressed closure for said opening,` a scraper, and arod, for o erating said scraper, extending through sai closure and lhaving a lug or projection, arranged near i i the scraper,adapte to engage with said closureto remove the same from the opening to permit of the removal of the refuse from the screen.

17. In a machine of the character described, the combination with a casing having an opening in its side, of a screen-plate -arranged in said casing on a level with said opening, a bracket secured vto said casing, a

spring arranged between said bracket and -said closure whereby the latter is pressed over said opening, a scraper, and a rod, for operating said scraper, extending through said closure and having a lug or projection,

karranged near the scraper, adapted to ensaid opening, said rod having a lug or proj ection, arrangednear the scraper, adapted to engage saidclosure to remove the same fromthe opening to permitof the removal of the refuse from the screen. Y

19. In a machine of the character described, thev combination with a casing having an inlet-opening, a screen-plate arran ed in said casing,`and a strip arranged wit the casing near the inlet-opening and extending above said opening, for the purpose specified. p l

In testimony whereof I aEx my signature in presence of two witnesses.

` FRANK M. CHAPMAN. Witnesses: i l

W. J. GALLAGHER, E. M. HURLEY. 

